How to set up capture times

Christian Huitema edited this page Sep 28, 2018 · 3 revisions

In the ITHI project, the metrics M4 M6 and M8 aim at understanding DNS usage. They are computed by aggregating capture from multiple sources. Each of these sources is a network operator, managing a DNS recursive resolver. If you have volunteered to be one of these sources, thank you! Hopefully, the following rules will help you setting up the capture in a useful way:

  • Set up a capture script to run at least once a week, but preferably 4 times.

  • Set these four times to correspond to:

    • One capture in the morning, during a work hour of a work day,

    • A second capture in the afternoon, during a work hour of a work day,

    • A third capture during the evening of a work day,

    • A fourth capture during a weekend.

  • Each of these capture sessions should try capture one million transactions.

These rules are designed to minimize statistical bias. We are concerned with three kinds of bias:

  1. Internet usage is probably different in different locales. For example, people in Germany are significantly more likely to access names in the ".de" domain than people in India.

  2. Internet usage is different when people are working and when they are just enjoying the Internet. For example, we are more likely to see erroneous request for the ".corp" string from people at work than from people at home.

  3. Internet usage may vary based on the day of the week. For example, people are more likely to watch movies or ballgames during weekends than during week days.

We are addressing the locality bias by recruiting volunteers in many countries and regions. But in each of these volunteers to capture as much as possible the variations between different hours of the day (working or leisure) and different days of the week (workdays and weekends).

When you are writing the capture script, please make sure that it create capture file names that include the date of the capture, such as "mysite-2018-04-01.csv".

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